Rhiwlas (Llandderfel) Weather Forecast, Gwynedd LL23 7

Today 15 Aug Wales

Any low cloud and patchy fog soon clearing, leaving a fine day with lengthy periods of strong sunshine. Feeling very warm with just a light breeze for most. Maximum Temperature 28C.

Tonight 15 Aug Wales

Warm and sunny this evening and staying dry overnight but perhaps becoming cloudier in places later. Turning a little fresh in some rural areas with the odd mist or fog patch, but much milder in coastal and urban areas. Minimum Temperature 11C.

Sat 16 Aug Wales

A cloudier start to the day is possible for some, but sunny spells soon developing. Mainly sunny by the afternoon and turning very warm. Breezier, especially in southern coastal regions. Maximum Temperature 27C.

Sun 17 Aug Wales

Breezy with plenty of strong sunshine on Sunday. Often dry early next week too but showers or thunderstorms are possible, mainly on Monday. Blustery at times but often very warm.

Mon 18 Aug Wales

Breezy with plenty of strong sunshine on Sunday. Often dry early next week too but showers or thunderstorms are possible, mainly on Monday. Blustery at times but often very warm.

Tue 19 Aug Wales

Breezy with plenty of strong sunshine on Sunday. Often dry early next week too but showers or thunderstorms are possible, mainly on Monday. Blustery at times but often very warm.

Wed 20 Aug Wales

High pressure is expected to drift to the northwest at the start of this period. This will allow a north to northeasterly airstream to affect much of the UK, leading to rather cool conditions in some northern and eastern areas. As a vigorous area of low pressure emerges into the North Atlantic by the following weekend, connected to what is currently Tropical Storm Erin, high pressure may re-build across the UK for a time, bringing widely fine and dry conditions and for some, an increase in temperatures, relative to the previous few days. The final week of August may see Atlantic weather systems progress over the UK, with a small chance of widely wetter and windier weather developing, though there is much uncertainty in this aspect of the forecast.

Thu 21 Aug Wales

High pressure is expected to drift to the northwest at the start of this period. This will allow a north to northeasterly airstream to affect much of the UK, leading to rather cool conditions in some northern and eastern areas. As a vigorous area of low pressure emerges into the North Atlantic by the following weekend, connected to what is currently Tropical Storm Erin, high pressure may re-build across the UK for a time, bringing widely fine and dry conditions and for some, an increase in temperatures, relative to the previous few days. The final week of August may see Atlantic weather systems progress over the UK, with a small chance of widely wetter and windier weather developing, though there is much uncertainty in this aspect of the forecast.

Rhiwlas (Llandderfel) Weather Forecast

Today 15 Aug Wales

Tonight 15 Aug Wales

Sat 16 Aug Wales

Sun 17 Aug Wales

Mon 18 Aug Wales

Tue 19 Aug Wales

Wed 20 Aug Wales

Thu 21 Aug Wales

Temperature Forecast Met Office

Temperature Real-Time

Clee Hill (Shropshire) Radar

National Satellite

National Synoptic

Rhiwlas (Llandderfel) Temperature Statistics

August Temperature

Lake Vyrnwy Saws (20km)

Lowest 9 January, 2025

Average 2025

Highest 11 July, 2025

Lowest 2 July, 2025

Average July

Highest 11 July, 2025

Lowest 2 August, 2025

Average August

Highest 12 August, 2025

Climate (2020–Present)

Lake Vyrnwy Saws (20km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025